快速答案
dia 是一天这个时间段；data 是它在日历上的具体日期。
可靠的方法是先判断这个词在句子里的功能，再翻译。
每个词的作用
dia
day
Use dia for a day as a period of time or an experience.
data
calendar date
Use data for the numbered day, month, and often year assigned to an event.
如何选择
- dia: Choose dia if the sentence points to a day as a period of time or an experience.
- data: Choose data if the sentence points to the numbered day, month, and often year assigned to an event.
例句
Hoje foi um dia longo.
Today was a long day.
Qual é a data da reunião?
What is the date of the meeting?
常见误区
Data is not the ordinary word for a romantic date. Depending on the situation, use encontro or sair com alguém.
放到语境中练习
从你的真实生活中选一个句子，写两遍：一次用 dia，一次用 data。如果两个版本都可以，说明意思怎样变化。